Insp Greg Evans from West Midlands Police Force CID, said: “This was a very nasty incident and one that has left a teenage boy with injuries that will have life-long implications for him.

“We believe there was some kind of altercation between two groups of children which rapidly escalated and resulted in a stabbing.

“If anyone has any information about the attack or who may be responsible – or anyone who witnessed the attack at 6.40pm on Monday or people fleeing the park – I would appeal to them to get in touch.”

Anyone with information on the stabbing is asked to call West Midlands Police on 101 quoting log 2003 of 27 August.

Monday 27th - Man stabbed in Kings Heath

Stabbing in Kings Heath

A fourth victim was stabbed on Bank Holiday Monday after a row erupted on a Kings Heath street.

A man in his 30s was knifed in the arm after an argument sparked between three men on Kingsthorpe Road shortly before midnight.

Paramedics arrived at the scene shortly after midnight on Tuesday and treated the man for a stab wound to his arm.

He was taken to hospital, but was later released as his injuries were not believed to be life-changing.

A statement from the West Midlands Ambulance Service read: "We were called to reports of an assault on Kingsthorpe Road, Kings Heath, at 00.02 this morning. One ambulance and a paramedic officer attended the scene.

"We treated a man in his 30s for an arm injury before he was taken to hospital for further assessment."

No arrests have been made and West Midlands Police is still searching for the offender.